SQL term used to describe when a `SELECT` statement is used as part of a larger SQL statement. The larger statement may be DML and is always found within brackets or parenthesis.

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103 views

How to organize long Query

I have a massive query string that I am trying to pick apart for a project I am working on. I am looking for some guidance on how to take it apart(format it into human readable). Also, what are the ...
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33 views

subquery in set clause retrieving different values

I want to update the column "kstplcode" using different values coming from column warehouse except the value "main" with their corresponding delivery numbers. I've tried this code but the set clause ...
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2answers
42 views

Which query performs better when searching a row where a column has maximum?

Consider a simple table for example purposes: person(name varchar, age int) I have a task to retrieve the oldest person. Which query is better in general for such problems? Query 1: criteria with ...
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2answers
484 views

How to access row value from UPDATE sub query function?

I would need to use UPDATE like this: update offer set (bank, bank_id) = (cost, gid) from ( select cost, osm_points.gid from pgr_kdijkstraCost( 'SELECT gid as id, source, target, walk_cost as cost ...
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99 views

How to subtract records from a table based on their existence in another

I have an Access 2010 table Assignment key Empl Number key Year Number key Week Number key Proj Number It assigns employees to zero or more projects for given work weeks, thus, all ...
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78 views

Spatialite: use of virtual spatial index for distances

I'm currently learning to use spatial access methods for query optimization. I'm going through the examples in spatialite cookbook and got stuck in here http://www.gaia-gis.it/gaia-sins/spatialite-...
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1answer
43 views

Passing filter params to a sub query

I'd like to create a view from the query below, but the query contains a sub query which I need to apply a filter to (the place is marked with a comment). I'm wondering if it's possible somehow to ...
3
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1answer
386 views

How to union four different tables

I have two tables whereby both of them use sub queries. These two tables are combined by using UNION ALL. I have two other tables that only uses a WHERE clause and both of these are combined using ...
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1answer
233 views

Select records as groups based on sequence and date

I have data stored as: CompID | Seq | Udate | Utime --------+-----+-----------+------- mx433 | 1 | 1/1/2012 | 13:54 mx433 | 1 | 1/2/2012 | 13:43 mx433 | 2 | 1/4/2012 | 14:23 mx433 ...
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2answers
29 views

In MySQL, get number of pregnant women who received 3 ANC checkups

I am working on a project where it is required to find out the total number of pregnant women who have received 3 ANC(Ante-Natal Care) checkups done. A pregnant women is said to receive 3 ANC ...
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2answers
76 views

Insert query with a subquery

I want to insert somewhere around 400 rows into a table. All of the column values will be the same fixed value for most of the columns, with exception to one column which I want to pull from a fairly ...
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52 views

Smallest unique string among multiple columns

Somewhat similar to the Largest Common Substring (http://en.wikipedia.org/wiki/Longest_common_substring_problem) I'm trying to find the smallest unique string from a table. In some tables, its just ...
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3answers
4k views

Check if any of the values is in a subquery result

I have a complicated subquery that returns a list of order IDs. I need to get a list of customers who have these orders. The problem is that there are two ways of assigning a customer to an order (one ...
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1answer
77 views

Using a subquery in a LIKE statement

I need to write a subquery inside a LIKE statement. This subquery would return me a word that I need to find in the middle of a sentence (that belongs to another field). Is it possible? This is how I'...
4
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1answer
154 views

Combine multiple queries into 1 query

I have a message table in Postgres 9.4 that contains a words field of array type, with random words of a message. Currently I have millions of messages: \d messages Table "...
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91 views

Indexing on cached data from related table using triggers — Is there a better way?

Edit: Schema details per request from Aaron Betrand -- I'll break the schema down to the relevant fields of the two tables. Orders (ID int IDENTITY, Status char(1)) Services(OrderID FOREIGN KEY ...
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1answer
507 views

Call function where argument is a (sub)select statement

My function takes an int4 as argument and returns a table: SELECT * FROM test_function(545421); -- works fine SELECT * FROM test_function(SELECT customerid FROM tableX ...
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372 views

Amazon Redshift: “*SELECT* 1” vs. volt_dt_0 vs. volt_tt_51343b6aa3bd4

I've noticed subqueries in Amazon Redshift can be represented in the explain plan in 3 separate ways: -> XN Subquery Scan "*SELECT* 1" -> XN Subquery Scan volt_dt_0 -> XN Seq Scan on ...
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31 views

Subquery optimization

I was reading through this article - http://explainextended.com/2009/09/18/not-in-vs-not-exists-vs-left-join-is-null-mysql/ I am working with an existing design. What I want is to be able to select ...
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1answer
103 views

on every row on SELECT Query must lookup to other table

I'm working on Login/Logout System and I'm facing this problem regarding on SELECT Query. I have 2 tables namely dtr_tbl and shift_tbl. In dtr_tbl are the logs of the user(login/logout time details) ...
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1answer
141 views

Alias of Subquery not working

I have been trying to get an order by to work correctly with an aggregate function. i.e. order by (bp + points) I also try adding these as a total amount from the following query however. If I try ...
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1answer
106 views

MySQL Update a table based on the last data from another table while grouping with conditions

I need a query to UPDATE a series of fields based on another table Table lp_plates_backup | uid | brand | model | | 1 | | | | a | Old | Error | |...
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1answer
34 views

Pick up the name of the column by two diff column in single table

Thank you guys in advance! i am desperately need to display my data in this way, My database structure is, Column idcat, parent_id and child_id is sharing single column name, catname. I tried ...
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1answer
117 views

Single-row subquery returns more than one row

I try to run the follwoing query but it gives me 'Single-row subquery returns more than one row' error. BEGIN FOR C2 IN (SELECT S.bom_header, S.sap_cage_cd, I....
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2answers
347 views

Match multiple components of a subquery CTE in PostgreSQL

I've got an app that grants access to users in varying different ways, and I'm attempting to write a query that determines access in all the different ways, but is readable, by breaking the access out ...
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1answer
271 views

Why is my SQL Server query behaving differently on UPDATE than on SELECT?

I've written a SQL Server query that updates records to have a sequential number after partitioning on a field. When I run it as a SELECT statement, everything looks great: DECLARE @RunDetailID INT = ...
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1answer
585 views

Better way to select from nested tables in PostgreSQL

I have the following schema with millions of rows in the match table and each match have two sides (away and home). I want to create a view which shows the most significant data regarding the matches ...
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1answer
202 views

Postgres Nested WHEN Aggregate Function

In PostgreSQL (version 9.4) I am trying to construct a query to determine in various tranches how many times various numbers appear in the data set between ranges. When I query group-ing by "...
4
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1answer
112 views

Why is the subquery apparently correlated? How to avoid it?

I have a table orders and a table orderpositions. The orderpositions (basically the items bought with the order) are linked via orderid (indexed) to the orders primary key. For a given set of orders ...
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2answers
56 views

Delete the second record where a user has two records

I have a simple database scheme, which due to previously being badly set up has numerous duplicate records. record_table |--------------------------------------------------------| | id | subid | ...
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1answer
30 views

Querying All Records of All Users who have any instance of purchase behavior in their history

I am trying to write a query that shows me all user ids that in any instance of usage have a particular type of "purchase credit" associated with their account. I have one table, "users" that shows ...
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1answer
89 views

Determine existence in recursive working table

I have a query that needs to check for existence of each input row type in another table, but it is unnecessary and inefficient to check for existence of subsequent rows of the same row type if one is ...
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108 views

Multiple subqueries performance issue

I have a query that collects customer data. I select a lot of correlated data from different tables. I want to have only ONE result row for each customer. The query looks like that: SELECT c.Id ,c....
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1answer
377 views

How to make a single row result query to return multiple rows

I have the following WITH SQL Query which does select a set of filling stations along a route within the distance of 1000m. To have the measurement in meter I cast the geometries to geography. I also ...
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1answer
103 views

Is it possible to emulate the WITH command in MySQL 5.1.73? [closed]

I have the following query: SELECT COUNT(*) AS `count` FROM agreements WHERE start_date >= STR_TO_DATE('14-01-2015','%d-%m-%Y') AND start_date < STR_TO_DATE('15-01-2015','%d-...
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1answer
130 views

problem with query two different tables with foreign key relations

I am having a problem with querying two tables with different foreign key relations... My first query works fine but when adding another table with a different set of relations I am having a problem......
2
votes
1answer
8k views

Postgres error [column must appear in the GROUP BY clause or be used in an aggregate function] when sub query is used

I have two tables employee and phones. An employee can have 0 to n phone numbers. I want to list the employee names with their phone numbers. I am using the below query which runs fine. SELECT ...
2
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2answers
191 views

Slow subquery in SELECT statement

Having tried many different methods, I can't get my query taking shorter than 40 seconds to run with a dataset of ~11000 rows. The table is a list of hotel bookings, containing (most relevant) Check-...
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1answer
16k views

MYSQL query to find records between two date range

I am working in a web application using PHP and MySQL. I have two tables Employee employee_id email_id 3 tl1@jasmine.com 4 agent1@jasmine.com 5 agent2@...
3
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2answers
519 views

Why wouldnt Mysql use index on the Primary query in a nested query

I have two tables: search_criteria and pricing. There is an index on search_id column in search_criteria table and on pricing_id column in pricing table. But running this nested query does not use ...
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1answer
46 views

Email open rate calculations in subqueries with postgres

So I'm relatively new to PostgreSQL, but here we go: I have a pgsql database that is receiving HTTP Post Email Events from my Sendgrid email server, and am trying to make a dashboard that displays ...
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1answer
50 views

Slow execution of a subquery with 0 matches

In MySQL, I have two basic tables - Posts and Followers: CREATE TABLE Posts ( id int(11) NOT NULL AUTO_INCREMENT, posted int(11) NOT NULL, body varchar(512) NOT NULL, authorId int(11) NOT ...
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2answers
134 views

Solution on a complex sub select query SQL Server

I created a SQL query that requires me to pull data from 2 separate databases, and I noticed that what I did is this: Select *, (Select Z.f From DatabaseZ.TblZ Z where Z.w = A.w) as valueZA, ...
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1answer
155 views

MySQL: Why queries with subqueries are much faster than single query?

I made few queries on my db lately First query: SELECT `table`.* FROM (`table`) WHERE table.id in(27172172,[...bunch of ids...],27171770) ORDER BY field (`table`.`id`, 27172172,27172168,[......
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1answer
73 views

Select products and include all cities it belong to

I have 2 tables : PRODUCTS +----------+----------+----------+----------+ | id | title | content | city | +----------+----------+----------+----------+ CITIES +----------+----------+ | ...
0
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1answer
13k views

Identify faulty sub-query (subquery returned more than 1 value)

I am trying to resolve an issue with a query that fails with this error: Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when ...
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4answers
107 views

Why does this query take 32 sec to execute?

I keep my history records in one table and my pertinent data in another. I want to grab only the files from myfiles that currently have a given status recorded in statuses (ie, the latest status is ...
0
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1answer
66 views

Stacked Left Joins or Left Join inside a Subquery?

OK, this is a fun one. Designing a database for a gaming system. I have 3 tables that are relevant for the query I'm trying to work on right now. character_skill_log with the relevant fields of id, ...
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1answer
260 views

Oracle: summing column value with subquery?

Are there some restrictions in Oracle that disallows to have a WHERE clause that compares value of column+(subquery count(*))? If the subquery table is empty, count(*) doesn't yield to zero in this ...
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2answers
130 views

Subquery or multiple left joins, or both?

I have two tables, for simplicity table1, with id as Primary key, and a field name, and table2 with the same. Each table has quite a few records, but during a complicated form process, the user is ...